Sweden has the biggest share of biogas in transport sector among the member states of the European Union. The government of Sweden announced an official plan to replace its gas vehicles in transport sector with biogas vehicles 100% by 2030. The exemption of energy and CO2 taxes is assessed to be the most influential policy in expanding biogas in transport sector. The fact that the European Commission has recently approved the extension of the exemption of the fuel tax of the Sweden’s transport sector has proved the effectiveness of the policy. But, the approval from the European Commission for review of the fuel tax of member states can constrain promotion of the renewable fuel as it can conflict the prevailing consensus of opinion among the member states that the expansion and development of energy sources is deeply concerned with energy security. Thus, amendment in the state aid relevent guideline of the European Commission needs to be made in that the review and the approval should be made at the level of state. In parallel with that, Strengthening promotion of the proven voluntary food waste sorting-out policy to secure the wastes of quality for production of biogas, expanding the refueling and recharging places of biogas, and boosting the existing incentives of biogas for promotion of private investments into National Gas Grid, should be put into consideration for expanding biogas in transport sector of Sweden. Last but not least, as the biogas has big locality as renewable energy source, the set-up of integrated and cohesive guideline considerinng the locality in terms of expanding biogas vehicles in number, is thought to be the most significant factor to consider, as it can help secure the biogas of quality, and strengthen the conditions of the relevant infrastructure.